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Re: How do I make an object visible based on the light it's recieving

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Steve Bentley
Re: How do I make an object visible based on the light it's recieving
on Oct 25, 2019 at 10:38:13 pm

Or you can use a compositing tag and tell the sphere to not show in the camera and to not cast shadows (is it blocking the light perhaps - make the sphere really really big). You can also exclude the sphere from the main light's project tab so it doesn't blow out the luma map.

If you can use an HDRI texture in the sphere's luma channel (assuming a Global Illumination (GI) render) that will give you a better reflection than a standard 8 bit image (often you have to mix down the luma channel's image with a standard black luma color so the HDRI doesn't light the scene like a thousand suns)
But if you go the GI route, the addition of the overhead light is almost swimming against the current. With GI, the scene is getting its light and shadows from the texture in the sphere's luma map. If you need to art direct lighting, its often better to add a disk object and add an hdri map that is a basic circular or square radiating gradient to the luma map for the disk and move that around in the scene like a bounce reflector on a photo shoot. That disk "becomes" a light.

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